Friction Factors of Stacks of Perforated Regenerator Plates
The flow resistance of stacks of perforated copper plates has been measured using liquid nitrogen as fluid. Spacer wires of 0.15 mm diameter have been inserted between the plates. Flow velocities and Reynolds number have been based on the hole diameter; (cylindrical hole of 1.397 mm length with a diameter of 0.356 mm). The friction factors obtained are compared to theoretical solutions for tubes of short to moderate lengths. Data are above the prediction for ideal tubes. The pressure drop for two plates is 16% larger than the two-fold value of the single plate result. For 6 plates, the pressure drop per plate has been found to be enhanced by the same order of magnitude, however the velocity range in the experiments is reduced into the Reynolds number range below 1000.
KeywordsPressure Drop Friction Factor Momentum Flux Laminar Boundary Layer Perforated Plate
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